NoCheatPlus
Detect and fight the exploitation of various flaws/bugs in Minecraft!
Introduction
NoCheatPlus attempts to prevent cheat clients from exploiting weaknesses of Minecraft or its protocol, making your server more safe. Checks cover a wide range of issues including flying and speeding, fighting hacks, fast block breaking and nukers, inventory hacks, chat spam and other types of malicious behaviour. For a more complete list have a look at the Features Page.
NoCheatPlus puts emphasis on configurability and allows you to customize actions that are carried out when a player fails a check (e.g. silent cancelling, executing commands, just logging). Bypass permissions allow to control what check to apply for which players, all checks can be deactivated in the configuration, also having the option for world-specific configuration files. Many checks allow more detailed configuration to adjust sensitivity.
Certainly NoCheatPlus is not a magical bullet, it uses a lot of heuristics and even guessing, so you will encounter false positives here and there and also not catch every single violation. Example video of how NoCheatPlus blocks cheats (outdated plugin version).
NoCheatPlus was introduced by NeatMonster, building on the code base of NoCheat by Evenprime.
Recommended
The following plugins might be useful to have a look at.
ProtocolLib
Allows NoCheatPlus to activate packet-level checks, covering a range of exploits that can't be monitored using ordinary means. Since roughly Minecraft 1.7.10, the fight.speed check can't work as expected anymore, due to changes in CraftBukkit. With ProtocolLib this can be repaired.
CompatNoCheatPlus (cncp)
Make plugins like mcMMO or MachinaCraft more compatbile with NoCheatPlus. Not all existing plugins are covered (yet), but you can leave a note or create an issue/ticket request for cncp. Phasing out: Citizens 2 should work with NCP out of the box, MagicSpells are working on compatibility too - rest will be integrated into NCP.
Orebfuscator
Orebfuscator fights all sorts of X-ray-hacks by altering the map information that is sent to the players, such that they have to mine blocks to actually reveal what is behind. Virtually a "must have". (Latest versions of Spigot contain features of Orebfuscator.)
Downloads and History of Changes
- Download officially approved versions on the Files page at BukkitDev.
- Development builds have been moved over to the Jenkins at md-5.net.
- Do not download from any other source, do not use jars other people send you.
- Change lists: Wiki (digest) | Jenkins (by build number) | GitHub (all commits).
- Source code
Plugin statistics are no longer reported to mcstats.org.
Support
Documentation Resources
- Consider first: Frequently asked Questions and Known Issues.
- Wiki (Configuration, Permissions, Commands)
- Developers might have a look at the page describing the API of NoCheatPlus.
Contact us
- Quick questions can be asked on this page,
or on IRC (Server: irc.spi.gt | Default-Port: 6667 | SSL-Port: 6697 | Channel: #nocheat | Web client: WebIRC) - For real issues or feature requests please create a new issue/ticket or add to an existing issue/ticket.
- To send information that is not to be seen by all, you can also reach us by PM to @asofold and @MyPictures. @IceAP (IRC: ICE) will also help or redirect the conversation. Please do not contact the user 'NoCheatPlus', it is for administrative purposes only and will likely not be answered in time. Keep to BukkitDev and GitHub for support, do not trust users on other forums or websites, also not if their nick names are the same as NCP staff on BukkitDev.
Please always state the output of the "ncp version" command to let us know versions in use (users of cncp also the "cncp" command).
Comments
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_ForgeUser9668734 Owner
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_ForgeUser15078623 Ticket Manager
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_ForgeUser16101223 Contributor
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_ForgeUser7091862 Former Author
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_ForgeUser7459264 Former Author
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Forge_User_61842651 Author
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MyPicturesCP Artist
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Posted Aug 12, 2012@imaapseudonym
Try using the latest build, if not, just leave it disabled.
It's not worth the player damage it causes atm for me anyways. I can live with people running around with nofall hacks, we have plenty of other ways for them to die :)
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Posted Aug 12, 2012A lot of my players on my server are dying to the nofall anticheat. However, this is not due to cheating; this is due to some server lag at times and players falling while teleporting. I turned off that permission for now but is there any way to fix this?
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Posted Aug 12, 2012@aphilosopher
It would be more like putting a VL>50 to the start before all the actions start.
so like actions: VL>50 ....(whatever was there before) ...
So that below that violation levl nothing would happen, not even logging.
The exact value if 10, 20 , 50 is a matter of testing / experience, i could not tell directly.
You could give dev build #17 or #18 a try, some of the nofall issues seem somewhat settled, though instead of having normal fall damage, NCP will deal it stating a violation, which is a bit strange but not too far off.
Still relaxing the survuivalfly cancel limit to >30 or 50 might do the trick with the jumping on placed blocks, i can't tell how many blocks cheat clients can fly then before getting reset, though.
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Posted Aug 12, 2012@asofold i actualy wanna lower its restriction, as in make it more lenient regarding jump height, my players are having alot of trouble doing things like jumping and placing a block under them to make a pillar, it occasionaly(often) registers as too high a jump and knocks em off the pillar, so i wanna give them more room for jump height to try and alleviate this
pardon me for being slightly confussed on which portion i would edit to accomplish this, what i have in my config now is
<<code survivalfly: active: true actions: log:flyshort:3:5:f cancel vl>100 log:flyshort:0:5:if cancel vl>400 log:flylong:0:5:cif cancel>>
<</code>>
so i would alter it to be
<<code survivalfly: active: true actions: log:flyshort:3:5:f cancel vl>150 log:flyshort:0:5:if cancel vl>400 log:flylong:0:5:cif cancel>>
<</code>>
am i right? i alter the 100 to become 150 or some other variation of an increased numeral to accomplish less checking of the jumping?
just trying to confirm i understand that correctly before i alter it and screw something up xD
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Posted Aug 12, 2012@aphilosopher
I thought that it had been a hidden setting if at all, but it seems not to be present (i might be mistaken).
Probably the checks have been integrated / replaced with the survivalfly checks. You could set the VL for cancelling survivalfly a little higher (experience... 10, 30, 50 ?), in order to allow more jumping.
The old (partly outdated) instructions.txt can be found here:
https://github.com/NeatMonster/NoCheatPlus/blob/ba6e2e5a5df63201dd66e1d5c4672c3c131cac36/Instructions.txt
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Posted Aug 11, 2012@asofold
specificly i was seeking out the instructions.txt because im trying to figure out how i can adjust the limit placed on the players jump height,
when they jump higher then they are supposed to nocheat puts em back to the ground,
id like to adjust this setting for a few particular reasons, but i could not find this one in the config, am i missing it?
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Posted Aug 11, 2012@levisn1
It seems so, unfortunately someone changed the link to the old instructions.txt to the not yet finished configuration section on bukkitdev, while at the same time the instructions.txt has been removed by default - this is being re-structured, at least form the side of documentation.
Some stuff will get changed during dev-updates. I could link an older version of instructions.txt, as i did in a post before, if needed.
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Posted Aug 11, 2012arrivalslimit is now called relogin?
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Posted Aug 11, 2012@lithium210
Please update if it still happens with chunk problems :)
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Posted Aug 11, 2012oh my bad.. seen the post below about the oreb issue and editing the eating problem in the config. will try this right now. thx!
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Posted Aug 11, 2012Having a hunger issue where you'll overeat or notifying me of players eating too fast. Also huge chunks are missing when used with orebfuscator but after removing nocheatplus, chunks are fine.
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Posted Aug 11, 2012@MyPictures
@asofold
Thanks, I'll just use #2 for now with NoFall deactivated - thanks for the work :)
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Posted Aug 11, 2012Damn.. so close to a fasterfly fix.. :( no more snapping to ground, but you effectively don't actually move anywhere now.
You do just stay in one place.. even doing WE commands the selections just stay on one block like you don't move.
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Posted Aug 11, 2012@Puremin0rez
Yea I kinda made my experience also with that awful bug, @Neat will look over it today. You can maybe hotfix it by removing that permission from OP or "*":
- -nocheatplus.checks.moving.nobukkitcheck
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Posted Aug 11, 2012@LEOcab
Last version refers to Build #3 ?
I could reproduce the minecart bug, which is severe.
The hunger glitches - you are refering to instanteat checks ? You might simply disable them in the configuration file (inventory / instanteat / active: false).
Are you using Orebfuscator ? If so, make sure you are using the latest verison of it, it has gone through many fix-versions for that and similar matters. If not ... interesting! (I made No Void Damage plugin for that purpose, as an emergency "fix", but that might not meet your taste.)
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Posted Aug 11, 2012@Puremin0rez
Thank you forthe notice, this might have been a communication failure, i had been talking with NeatMonster about this and in the last testing phase it seemed they were testing out these issues, however i did either not notice the results, or it was tested too stationary.
So we will continue tomorrow (european time) looking into that and other issues.
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Posted Aug 11, 2012Minecarts kill on exit as of last version... among with several annoying hunger/eating glitches. ;_;
Also: DeathTpPlus says the person 'died in the void' once they log out, but they don't die.
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Posted Aug 11, 2012Okay, um, the bypassbukkitcheck thing is totally messed up.
It lets me use fly mods just fine, but nobody on the server sees me moving and i cant break blocks and chunks don't load. It's like my actual player is still where I activated the fly mod at.
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Posted Aug 11, 2012Good job :)
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Posted Aug 11, 2012Side notice: Build #3 is on jenkins, it fixes some things including flying with client mods given the right permission (which i don't know right now), MypPictures might remember, various adjustments for NoFall and other - unfortunately the survivalfly check still triggers for jumping on blocks that one has placed underneath just before, contiuous placing and jumping seems to about work, but then jumping on will trigger the check - might be adjustable by configuration for relaxing the cancelling as a temporary trade-off.)
The permission to disable the bukkit-intern flying/speeding checks for a player is : nocheatplus.checks.moving.nobukkitcheck(Seems to be problematic, will have to wait till tomorrow for that.)
Otherwise CompatNoCheatPlus allows setting the bukkit intern speed limits (needs enabling the set-speed hook) if they should be needed.
This build might well be marked as broken, do not use minecarts !